Unable to access IIS application from server it's hosted on but can from the rest of the net

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http://serverfault.com – I have an ASP.Net 4.0 application hosted using IIS 6.0 on Windows Server 2003 server. The application is using integrated authentication i.e. Active Directory. Using the same login, i can access the application from the net using a username of DOMAIN\user plus password. However the app wont authenticate when i RDP into the server and pop a browser open and try to hit the app. Initially i tried using a different dns mapping i.e. a 192.168.x.x mapping in the servers DNS for local users (no reason to go out on the net right) but that wouldn't work so then i used a "proper" internet ip and it st (HowTos)